WCMCU-5102 module

// Canonical beginner example for the WCMCU-5102 module on Arduino Uno
// This sketch does not use an I2S library so it compiles on the default AVR core.
// It demonstrates basic control of the module's mode pins and confirms the board is running.
// IMPORTANT: The module output is line-level only. Do NOT connect a speaker directly.

#include <Arduino.h>

// Wiring used in this example:
// VCC  -> 5V
// GND  -> GND
// XMT  -> D9
// FMT  -> D8
// SCL  -> D7
// DMP  -> D6
// FLT  -> D5
// L    -> A0 (monitoring only; optional, not read in this sketch)
// R    -> A1 (monitoring only; optional, not read in this sketch)

const int ENABLE_PIN = 9;
const int FMT_PIN = 8;
const int SCL_PIN = 7;
const int DMP_PIN = 6;
const int FLT_PIN = 5;

void setup() {
  Serial.begin(115200);

  pinMode(ENABLE_PIN, OUTPUT);
  pinMode(FMT_PIN, OUTPUT);
  pinMode(SCL_PIN, OUTPUT);
  pinMode(DMP_PIN, OUTPUT);
  pinMode(FLT_PIN, OUTPUT);

  // Enable normal audio output.
  digitalWrite(ENABLE_PIN, HIGH);

  // Typical PCM5102A-friendly control settings.
  digitalWrite(FMT_PIN, LOW);
  digitalWrite(SCL_PIN, LOW);
  digitalWrite(DMP_PIN, LOW);
  digitalWrite(FLT_PIN, LOW);

  Serial.println("WCMCU-5102 module example");
  Serial.println("Control pins set: XMT=HIGH, FMT=LOW, SCL=LOW, DMP=LOW, FLT=LOW");
  Serial.println("This example demonstrates wiring and power-up only.");
  Serial.println("Connect L/R to an external amplifier or headphones, not a speaker directly.");
}

void loop() {
  // Blink the enable pin very briefly once per second as a simple visible test.
  // The DAC stays enabled most of the time.
  digitalWrite(ENABLE_PIN, LOW);
  delay(10);
  digitalWrite(ENABLE_PIN, HIGH);

  Serial.println("Module control pins are active.");
  delay(990);
}